[ **up: [[Matter and energy]]** ] --- # Elements (Chemical) [[2024-0815. All matter in the universe is compose of one or more unique pure substances called elements.|'All matter in the universe is compose of one or more unique pure substances called elements.']][^1] The smallest unit of any element is an [[Atoms|atom]].[^2] [^1]: Lindsay M. Biga, et al., ‘1.2. Structural Organization of the Human Body’, in *Anatomy & Physiology* (Corvallis, OR: Oregon State University, 2019), https://open.oregonstate.education/aandp/chapter/1-2-structural-organization-of-the-human-body/. [^2]: Lindsay M. Biga, et al., ‘1.2. Structural Organization of the Human Body’, in *Anatomy & Physiology* (Corvallis, OR: Oregon State University, 2019), https://open.oregonstate.education/aandp/chapter/1-2-structural-organization-of-the-human-body/.